nrf54L15 - WatchDog functionality in deep sleep.

RE: nrf54L15 - WatchDog functionality in deep sleep.

varsha@ — Sat, 25 Oct 2025 07:37:38 GMT

Hello,

So, are there any reasons why the device can hang in deep sleep?

Are there any ways to avoid this issue?

RE: nrf54L15 - WatchDog functionality in deep sleep.

Sigurd — Fri, 24 Oct 2025 11:09:23 GMT

[quote user="varsha@"] Is there a way to debug what is actually happening during deep sleep {using function sys_poweroff();}? [/quote]

No, you will wake the chip up again then.

Here you can see what wakes the chip up from System OFF mode:

https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/pmu.html#ariaid-title4

RE: nrf54L15 - WatchDog functionality in deep sleep.

varsha@ — Fri, 24 Oct 2025 06:17:59 GMT

Hello,

Thank you for your reply.

Yes, I referred to the Data sheet. But I am working on a custom Board, and when I'm using deep sleep, the device gets hanged during sleep after a few hours of continuously working .For confirming this, I tried using Normal Sleep, and the device has been working continuously for almost 5 days now, without getting hanged. Is there a way to solve this?

Is there a way to debug what is actually happening during deep sleep {using function sys_poweroff();}?

RE: nrf54L15 - WatchDog functionality in deep sleep.

Sigurd — Fri, 17 Oct 2025 12:30:06 GMT

Hi!

As per, https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/wdt.html#ariaid-title3 , Entering System OFF mode will stop and disable the watchdog.